Pipe-wrench.



0. W. BLAKE;

PIPE WRENCH.

APPLIOATION :FILED AUG. s, 190s.

921 81 Patented; May il@ -o iur hllljltll@ PATENT muon;

oNEsnviUs w. BLAKE, or nENvEn, coLoEAno, AssiGNoa To JAMES J. BROWN, or DENVER,

f nominano.

ivo@ senesi.

Specication of Letters Patent.

atented May 11, 1909.

Application 1.ed August S, 1968'. I Serial No. 447,615.

-To 4all whomY it 'may concern:

ing drawings, and to the figures of reference marked thereon, which form a part of this speoication.

My invention relates to improvements in wrenches, my special object being to provide a pipe wrench which shall be of simple and economical construction, reliable, durable and etlicient in use.

ln improved construction, the shank of the wrench is toothed or serrated on one edge, 'and the adjustable jaw is provided with a pawl or dog 'toothed to engage the teeth ot the shank, for the purpose of securing the movable jaw in the desired poe sit-ion of adjustment. Connected with the movahle shank and engaging the scid pawl, is a locking device whereby, when .the jaw is properly adjusted., the pawl may be locked in place in such a manner that its teeth are prevented trom escaping from the interlocking teeth of the sha1 r.

Having briefly outlined my improved construction, l will proceed to describe the i' same in detail, reference being made to the accompanying drawing, in which is illustrated an embodiment thereof.

ln this drawing, Figure 1 is an elevation of a wrench equipped with my improvement, the paivlbeing shown in the locked position. Fig. 2 is a similar view, partially in section and showing the pawl in the unlocked position. Fig. 3 is an edge view of the wrench, looking in the direction of arrow 3, lig. 1.

The same reference characters indicate the same parts in all the views.

Let the numeral 5 designate the shank of the wrench which is provided at one extremity with a relatively stationary jaw 6, having a removable toothed block 'l' engaging a recess formed in the stationary jaw, and held in place by 'a screw 8 passed through the stationary jaw and engaging a threaded Opening formed in the block 7. The teeth of the block 7 are arranged to pre1 vent the escape of the pipe 9, or other similarly shaped article upon which the wrench may be used. Upon the shank 5 is slidably mounted a jaw 10, which is open to' receive the shank. The opening vin the slidable jaw is considerably largerlthanfis necessary for the shank ot the wrench and in this opening is inserted a pawl 12 whose forward extremity 13 loosely engages the jaw to allow the pawl the necessary movement for disengaging its teeth or serrations 14 from the toothedy or serrated edge 15 of the shank.

`v'lhe part 16 of the slidable jaw, remote from.`

the stationary jaw extends farther outi wardly from the shank than the forward part 17, thus making room for a locking device 1S which engages a recess 1 9 formed j in the pawl; this recess being longer 4than the engaging part 2O of the locking device to allow the latter the necessary adjustment. This locking device consists of' a small block, recessed as shown at 21, to form a seat for one extremity of a coil spring 22. The outer extremity of this spring is engaged by a small plate 23l which bears against the part 16 of the slidable, jaw farthest fromkthe shank. The locking de- `vice is capable of such adjustment in a forward direction, that the part of the block adjacent its recess, shall engage the part 16 of the slidable jaw, whereby the teeth of the pawl are locked in engagement with the corresponding teeth of the shank (see Fig. l).

When it is desired to unlock the pawl, the locking device is moved in the opposite direction, whereby the part 16 oit' the jaw is brought into register with the recess 21 of the locking device. In this event, the part 16 does not engage the body ofthe locking device on either side of the recess, the latter being of sufficient width to allow the part 16 of the jaw to enter. This being the case, the toothed portion of the pawl may be moved outwardly away from the toothed portion of the shank, (see Fig. 2), permitting the movable jaw to slide freely upon'the shank.

l@ne extremity of the pawl-is enlarged, als

The extremity 25 of the locking device is similarly enlarged for the same purpose.

From the foregoing descr1pt1on, the use roo and operation of my improved wrench will bel readily understood. Assuming that it is desired to use the wrench upon a pipe 9, the toothed plate 7 is brought into engagement with the pipe, after which the slidable jaw is adjusted to brin its inclined face 11 into engagement with t, e pipe also; then, by releasing the pawl, its teeth will move'into engagement with the 'corresponding teeth ofl the shank, after which the locking device is moved forwardly,bringing a part 26 of the said device underneath the part 16 of the slidable jaw, thus locking the pawl against movement. The wrench is then ready for use, since the movable jaw is prevented from accidental movement on the shank during use. As soon as the pipe turning operation i`scompleted, the locking device is moved rearwardly, or toward the free end of the shank, whereby its part 26 is disengaged from the jaw part 16, 'thus allowing the toothed portion of the pawl to be disengaged- 4from the corresponding portion of the shank,

when the jaw may be moved away from the pipe at will.

vIt will be understood that my improved wrench may be used in other relations, though it is more especially designed for use with pipes or other similarly shaped devices.

Having thus described my invention, what- I claim is: l

l. A pipe wrench having a shank serrated -or toothed on one edge thereof, a jaw slidably mounted on the shank, and havingan enlarged rearward portion extending beyond the serrated edge ofthe shank, -a pawl having its forward extremity loosely connected with the slidable jaw and in engagement with the shank, the pawl being serrated to interlock withthe lserrated portion of the shank, the serrated portion of the pawl being adapted to swing toward and away from the shank, within the enlarged portion of the jaw, and a locking device comprising a block having a'yielding element mounted between the pawl and the enlarged portion of the slidable jaw, the locking device being slidably adjustable in a direction lengthwise ofthe sensei shank, whereby the yielding element may be thrown in or out of engagement with the enlarged part of the slidable jaw according asv it is desired to unlock or lock the said jaw against sliding movement, substantially as described.

2. A wrench having a shank serrated or toothed on one edge thereof, a jaw slidable on the shank, al pawl having its forward extremity loosely connected with the slidable jaw and in engagement with the shank, the rear portion of the ja`w havingits shank opening enlarged, and a locking device comprising a block inserted in the enlarged opening and in engagement with the pawl, the said block being slidably adjustable lengthwise of the shank and being recessed to receive the enlarged portion of the slidable jaw, when the block is adjusted to unlock the pawl, the said recess of the block being provided witha yielding element, for the purpose set forth.

3. A wrench comprising a shank having a toothed edge, a jaw slidable on the shank, a pawl loosely connected with the jaw at one extremity to allow the pawl to be moved outwardly away from the shank, and a locking device comprising a block'slidable in the movable jaw, the said block having a recess,

a coil spring located in the said recess and' engaging a cap, the latter lin turn engaging the outer part of the `jaw, the locking device being capable of movement in the forward or rearward direction, .whereby the upawl may be locked in the position with its teeth or serrations in engagement with the corresponding elements of the shank, while, when the locking device is moved in the opposite direction, the pawl will be free to move outwardly, whereby its serrations are disen' gaged from the shank, substantially as described.

-lx1-testimony whereof I affix my signature in presence of two witnesses.

ONESIMUS W. BLAKE. Witnesses:

P. J. EDWIN ROBINSON, LoUIsE COSNER. 

